At the end of the first century AD when John wrote his gospel, there were still many people who called themselves disciples of John the Baptist. So, the evangelist clarifies the position of the precursor vis-a-vis Christ.

The Baptist was not the light of the world. He was just the first to recognise “the true light that enlightens everyone” (John 1:9). He was not deceived by the flattery of being called the messiah. He kept himself faithful to his mission.